US warns of Oracle Java 7 Security Manager Bypass Vulnerability!

US warns of Oracle Java 7 Security Manager Bypass Vulnerability! (http://www.us-cert.gov)

01/11/2013 – A vulnerability in the way Java 7 restricts the permissions of Java applets could allow an attacker to execute arbitrary commands on a vulnerable system.

A vulnerability in the Java Security Manager allows a Java applet to grant itself permission to execute arbitrary code. An attacker could use social engineering techniques to entice a user to visit a link to a website hosting a malicious Java applet. An attacker could also compromise a legitimate web site and upload a malicious Java applet (a “drive-by download” attack).

Any web browser using the Java 7 plug-in is affected. The Java Deployment Toolkit plug-in and Java Web Start can also be used as attack vectors.

Reports indicate this vulnerability is being actively exploited, and exploit code is publicly available.

Further technical details are available in Vulnerability Note VU#625617.

Impact

By convincing a user to load a malicious Java applet or Java Network Launching Protocol (JNLP) file, an attacker could execute arbitrary code on a vulnerable system with the privileges of the Java plug-in process.

Solution

Disable Java in web browsers

This and previous Java vulnerabilities have been widely targeted by attackers, and new Java vulnerabilities are likely to be discovered. To defend against this and future Java vulnerabilities, consider disabling Java in web browsers until adequate updates are available. As with any software, unnecessary features should be disabled or removed as appropriate for your environment.

Starting with Java 7 Update 10, it is possible to disable Java content in web browsers through the Java control panel applet. From Setting the Security Level of the Java Client:

For installations where the highest level of security is required, it is possible to entirely prevent any Java apps (signed or unsigned) from running in a browser by de-selecting Enable Java content in the browser in the Java Control Panel under the Security tab.

If you are unable to update to Java 7 Update 10 please see the solution section of Vulnerability Note VU#636312 for instructions on how to disable Java on a per-browser basis.

(Continue reading at http://www.us-cert.gov)

My Two Cents: Until further notice I recommend to Disable Java in web browsers if that is not possible then you need to disable Java “content” in your web browsers through the Java control panel applet. I have seen some crazy messages from this plugin. I am so happy we do not use this plugin at all for our applications. However we do have customers that provide us VPN plugins that require this, we have disabled Java until its fixed! Be safe everyone!!

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